Human Rib

Vendor

Not sold by a standard vendor.

Crafting

Not craftable.

Gathering

Not a gathered material.

Dropped by

Drowned Corpse Warrior	level 27
Drowned Corpse Fighter	level 27

Note: the monster level tells you the zone tier where it is found; exact spawn coordinates are not published in the game data. See the World Atlas for zone level bands and Dungeons & Raids for instanced drops.